linux-kernel - [PATCH v6 09/12] drm/tegra: Reset the SOR on probe

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Date:	Wed, 18 Mar 2015 10:52:24 +0100
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-tegra@...r.kernel.org
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Terje Bergström <tbergstrom@...dia.com>,
	David Airlie <airlied@...ux.ie>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 09/12] drm/tegra: Reset the SOR on probe

As there isn't a way for the firmware on the Nyan chromebooks to hand
over the display to the kernel.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
Acked-by: Stephen Warren <swarren@...dia.com>
Reviewed-by: Alexandre Courbot <acourbot@...dia.com>
---
 drivers/gpu/drm/tegra/sor.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index 2afe478..e6caacc 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -1458,6 +1458,20 @@ static int tegra_sor_probe(struct platform_device *pdev)
 
 	mutex_init(&sor->lock);
 
+	err = reset_control_assert(sor->rst);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to assert SOR reset: %d\n", err);
+		return err;
+	}
+
+	msleep(20);
+
+	err = reset_control_deassert(sor->rst);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to deassert SOR reset: %d\n", err);
+		return err;
+	}
+
 	err = host1x_client_register(&sor->client);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to register host1x client: %d\n",
-- 
2.1.0

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